Some of our Fastest Running Down The track Exhaust ports flow considerable less than some of our Flow bench bragging rights exhaust ports,We like to see real high air speed at the crack of the exhaust valve opening and enough area to not be restrictive.Some of the most refined NA cylinder heads are 55-60% ratio,ieNHRA Pro-Stock.If the 11 pro-port intake can get to 450-470cfm ,with correct air speed and crossectionals and good CFM to MCSA ,we would not be to concerned if the exhaust did not go 70-75%.Bill C.
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Checkered Flag Machine & Ceralli Competition Engines
Racing engines and induction development
http://www.checkeredflagmachine.net/
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